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TY - CONF AU - Jun, W.J. AU - Chai, J.-S. AU - Ghergherehchi, M. AU - Ha, D.H. AU - Kim, H.S. AU - Lee, J.C. AU - Mun, S.C. AU - Namgoong, H. AU - Yeon, Y.H. ED - Chrin, Jan ED - Schaa, Volker RW TI - Analysis of the Plasma Characteristics for Beam Current Optimization for TR-13 Cyclotron J2 - Proc. of Cyclotrons2016, Zurich, Switzerland, September 11-16, 2016 C1 - Zurich, Switzerland T2 - International Conference on Cyclotrons and Their Applications T3 - 21 LA - english AB - There is a TR-13 cyclotron that extracts energy of 13 MeV protons which is located in Sungkyunkwan University. The components of the whole cyclotron are so old that cannot reproduce the situation that had been operated generally. So the researchers in this laboratory were eager to improve the technical problems of the components and finally optimize the beam profile. The finally extracted beam current is critically depends on the initially extracted beam from the ion source injection system (ISIS). The ISIS is composed of several electrical instruments. The voltage or current which is applied to these components can affect the finally extracted beam profile. However, the original values for the input voltage or current is almost fixed to special values that had been written in the operation manual. It means that the bad condition of this cyclotron cannot be matched for these values which had been conducted in the best condition of the operation. So, by using the programmable logic controller (PLC), it is possible to use varying inputs in various conditions, and the beam current is able to be stabilized much better than applying the constant input values. Finally, this paper would show the tendency of the plasma generation in terms of modulating the applying input values which occurs inside the ion source chamber. It represents the plasma characteristics that critically influence the beam current. PB - JACoW CP - Geneva, Switzerland SP - 339 EP - 341 KW - plasma KW - ion KW - ion-source KW - power-supply KW - extraction DA - 2017/01 PY - 2017 SN - 978-3-95450-167-0 DO - 10.18429/JACoW-Cyclotrons2016-THP15 UR - http://jacow.org/cyclotrons2016/papers/thp15.pdf ER -